Trivial debugging :o|
Hello folks! I am writing a piece of code that takes a .wav file, encoded with 16 bits/sample, and has to perform a "thersholding" operation in these samples. That is, that groups of samples that don't have enough mean energy, shall not be included in the new .wav file that will contain the thresholded sample (the whole process is a short of compression).
The problem is, that for some reason I haven't discovered yet, only half of the bytes of the original file are found in the final file! (But, the thresholding mechanism works well in these half samples :P)
Could you please check on my code? 15 javies for the one who gives me a solution! :)
Here goes my code...
[696 byte] By [
miss_eleca] at [2007-11-27 11:35:23]
// 16bits/sample
// line 47 -> input .wav file
import java.io.*;
import javax.sound.sampled.*;
public class thresholding16 {
public thresholding16() {
try {
jbInit();
} catch (Exception ex) {
ex.printStackTrace();
}
}
AudioFormat audioFormat;
AudioInputStream audioInputStream;
//initial samples from File
byte buffer[] = new byte[10000000];
//thresholded samples ->to be written in a new File
byte newBuffer[] = new byte[10000000];
//the initial 2-byte samples will be represented as an integer (by merging the MSB,LSB of the sample)
int intArray[]=new int[5000000];
//mean energy of samples for every one of the 200000 groups of 25 samples
double energyArray[] = new double[200000];
public static void main(String args[]){
try{
thresholding16 thres=new thresholding16();
thres.moveToBuffer();
}
catch(Exception x){
System.out.println(x);
}
}
void moveToBuffer() {
int cnt=0;
try{
File soundFile =
new File("aFile0.wav"); //to arxeio eisodou pou 8a 'katwfliw8ei'
audioInputStream = AudioSystem.
getAudioInputStream(soundFile);
audioFormat = audioInputStream.getFormat();
System.out.println(audioFormat);
for(int h=0;h<10000000;h++){
buffer[h]=0;
}
while((cnt = audioInputStream.read(buffer,0,buffer.length)) != -1){
}
/*
System.out.println("Ta arxika deigmata ws bytes");
for(int j=0;j<10000;j++){
System.out.println(j+" "+buffer[j]);
}
*/
/*
//
FileWriter fistream = new FileWriter("16bitArxika.txt");
BufferedWriter outi = new BufferedWriter(fistream);
outi.write("Ta arxika deigmata ws bytes"+"\r\n");
for(int j=0;j<10000;j++){
outi.write(buffer[j]+"\r\n");
}
//Close the output stream
outi.close();
*/
//merge the 2 bytes of a sample int one integer
for(int j=0;j<5000000;j++){
int num=0;
int msb=0;
int lsb=0;
msb=buffer[j*2+1];
lsb=buffer[j*2];
int h=buffer[j*2+1];
if (h<0){
num=msb&lsb;
}
else{
num=msb^lsb;
}
intArray[j]=num;
}//end for
FileWriter fistream = new FileWriter("16bitArxika.txt");
BufferedWriter outi = new BufferedWriter(fistream);
outi.write("Ta arxika deigmata ws bytes"+"\r\n");
for(int j=0;j<200000;j++){
outi.write(intArray[j]+" ");
}
//Close the output stream
outi.close();
/*
System.out.println("Ena deigma -> enas integer");
for(int j=0;j<500;j++){
System.out.println(j+" "+intArray[j]);
}*/
for(int i=0;i<200000;i++){
energyArray[i]=0;
}
//Mean energy estimated from the type //Ε=10log(ε+1/ΝΣS^2(n))
for(int i=0;i<200000;i++){
for(int j=0;j<25;j++){
energyArray[i]=energyArray[i]+intArray[i*25+j]*intArray[i*25+j];
}
}
// System.out.println("Mesh Energeia ana omada");
for(int i=0;i<200000;i++){
double h=0;
h=Math.log(energyArray[i]/25+000000.1)/Math.log(10);
energyArray[i]=h;
}
//auxiliary array that tells which groups of bytes pass and //which do not
int booleanArray[] = new int[200000];
for(int j=0;j<200000;j++){
booleanArray[j]=0;
if (energyArray[j]>2.1){//the wanted threshold
booleanArray[j]=1;
}
}
for(int i=0;i<10000000;i++){
newBuffer[i]=buffer[i];
}
//I put 0 to the proper positions, depending on whether the //groups of bytes has passed the thresholding operation
for(int i=0;i<200000;i++){
if(booleanArray[i]==0){
for(int j=0;j<25;j++){
newBuffer[i*25+j*2]=0; // 0 at MSB
}
for(int j=1;j<26;j++){
newBuffer[i * 25 + j * 2 - 1] = 0; // 0 at LSB
}
}
}
FileWriter fstream = new FileWriter("16bitDeigmataKatwfliwmena.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write("Ta telika deigmata ws bytes"+"\r\n");
for(int j=0;j<10000000;j++){
out.write(newBuffer[j]+"\r\n");
}
//Close the output stream
out.close();
//the new .wav file
ByteArrayInputStream bis=new ByteArrayInputStream(newBuffer);
AudioInputStream ais=new AudioInputStream(bis,audioFormat,newBuffer.length/audioFormat.getFrameSize());
int cnt2;
cnt2 = audio system.write(ais,AudioFileFormat.Type.WAVE,new File("aFile0Thres.wav"));
System.out.println(" "+cnt2);
}
catch (Exception e) {
}
}//end of method moveToBuffer
private void jbInit() throws Exception {
}
}//end of class thresholding16
